Using a linq or lambda expression in C# return a collection plus a single value

Question

I'd like to return a collection plus a single value. Presently I am using a field to create a new list adding a value to the list and then returning the result. Is there a way to do this with a linq or lambda expression?

private List<ChargeDetail> _chargeBreakdown
    = new List<ChargeDetail>();

public ChargeDetail PrimaryChargeDetail { get; set; }

public List<ChargeDetail> ChargeBreakdown
{
    get
    {
        List<ChargeDetail> result =
            new List<ChargeDetail>(_chargeBreakdown);
        result.Add(PrimaryChargeDetail);

        return result;
    }
}

You might want to return a collection other than List<T> - msdn.microsoft.com/en-us/library/ms182142%28VS.80%29.aspx — Russ Cam
– Russ Cam, Commented Apr 7, 2010 at 22:38
@Russ thank you for the suggestion, I won't for the production code. ;) — ahsteele
– ahsteele, Commented Apr 7, 2010 at 22:41

adrianbanks · Accepted Answer · 2010-04-07 22:38:39Z

4

You could use a collection initializer syntax instead:

public List<ChargeDetail> ChargeBreakdown
{
    get
    {
        return new List<ChargeDetail>(_chargeBreakdown) {PrimaryChargeDetail};
    }
}

answered Apr 7, 2010 at 22:38

adrianbanks

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Comments

Lee · Accepted Answer · 2010-04-07 22:39:51Z

1

If you change the property type to IEnumerable<ChargeDetail> you could do:

public IEnumerable<ChargeDetail> ChareBreakdown
{
    get { return _chargeBreakdown.Concat(new[] { PrimaryChargeDetail }); }
}

Which could be simpler depending on how clients use the class (for example if they just iterate through the collection). They could always call ToList if they need to manipulate a list.

answered Apr 7, 2010 at 22:39

Lee

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